Browse Prior Art Database

PHOTORECEPTOR STRUCTURE FOR HALFTONE IMAGE

IP.com Disclosure Number: IPCOM000023506D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 207K

Publishing Venue

Xerox Disclosure Journal

Abstract

The instant disclosure is directed to a composite photorecep-tor structure suitable for use in halftone imaging. The structure is an active matrix, layered-type photoreceptor which comprises a photogenerating layer overlayed with a charge transport layer. The photogenerating layer comprises a photoconductive layer which has a screen, or its equivalent, buried in the interior of the photoconductive film but still allows for front exposure. The structure is basically, as mentioned, an active matrix, layered-type photoreceptor in which the photogeneration and charge transport functions are separated by employing two distinct layers. The transport layer is transparent in the visible range of the spectrum and is coated over the photogenerating layer. The photogenerating layer can be a vacuum deposited photoconductor or can be a pigmented binder layer.

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XEROX DISCLOSURE JOURNAL

PHOTORECEPTOR STRUCTURE FOR Proposed Classification
HALFTONE IMAGE U.S. Cl. 96/1,5
Samuel W. Ing mt. Cl. G03g 5/04
Warren L. Rhodes

The instant disclosure is directed to a composite photorecep-
tor structure suitable for use in halftone imaging. The

structure is an active matrix, layered-type photoreceptor
which comprises a photogenerating layer overlayed with a
charge transport layer. The photogenerating layer comprises a
photoconductive layer which has a screen, or its equivalent,
buried in the interior of the photoconductive film but still

allows for front exposure. The structure is basically, as
mentioned, an active matrix, layered~type photoreceptor in
which the photogeneration and charge transport functions are
separated by employing two distinct layers. The transport

layer is transparent in the visible range of the spectrum and
is coated over the photogenerating layer. The photogenerating
layer can be a vacuum deposited photoconductor or can be a
pigmented binder layer.

A specific example of the disclosure comprises vacuum deposit-
ing a photoconductive film in a certain pattern by having a
pin-hole mask situated an appropriate distance from the sub-
strate such that the thickness variation in the deposit would

approximate a sinusoidal distribution. A charge transport
layer, such as polyvinyl carbazole, is then coated over the
photoconductive layer.

Volume 2 Number 6 November/December 1977

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